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# Calculate the molar mass of the following substances.a.b.c. $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$

## a. $17.03 \mathrm{g} / \mathrm{mol} ;$b. $32.05 \mathrm{g} / \mathrm{mol} ;$$\begin{array}{ll}\text { c. } 252.08 & \mathrm{g} / \mathrm{mol}\end{array}$

#### Topics

Chemical reactions and Stoichiometry

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### Video Transcript

and this problem of being asked to find the molar mass of two different substances the first substance is and and h three. And then the second substance is, um and to H four. So for this, what we're going to be doing is beginning to find in order to find the molar mass. May want to look at our atomic masses here, both for nitrogen and for hydrogen. So four and hte three. Um, we have one nitrogen switched, my pen cut. We have one nitrogen, which has an atomic mass of 14 point 01 And we have three hydrogen, so it's gonna be three times 1.8 And when we add those values together, we're going to get a total of 17.0 34 grams Permal for the molar mass. And then for a second compound, we have two ends, so it's gonna be two times 14.1, and then we have four hydrogen. So the before times 1.8 again, add those together, we're gonna have a total of 32.5 two grams mall